Folding steel square and protractor



pt-20,1927. as SCHVETZ 1 643,033

FOLDING STEEL SQUARE AND PROTRACTOR 'Filed April 13, 1926 INVENTOR bangsdmx BY ATTO%EY 4 Patented Sept. 20, 1927.

GEORGE S. SCHVE'IZ, OF NEW YORK, N. Y.

FOLDING STEEL SQUARE AND PROTRACTOR.

Application filed April 13, 1926. Serial No. 101,684.

This invention relates generally to squares such as used by machinists,mill Wrights, carpenters and the like, the invention having moreparticular reference to a novel type of square. The invention has for anobject the provision of an improved square of simple construction and.

arrangement of parts. For the comprehension of the invention, and of theobjects and advantages thereof, reference will be had.

to the following description and aocompanying drawing, and to theappended claims in which the various novel features of the invention aremore particularly set forth;

showing the adjustable attaching means as used in combinationwith themodification of my improved square.

As here embodied my improved square comprises a main member 10 groovedor notched, at both sides of one extremity, as at 11, to engage themovable member 12, which is provided with an elongated aperture 13,located at the center of one extremity thereof. It being understood thatthe movable member 12 is pivotally attached to the said main member 10,as atlt, by a screw, bolt, or the like so as to permit the said movablemember to be pivoted as designated by the dot and dash lines 15, Fig. 1,0f the accompanying drawing and to be used as a protractor inconjunction with scale 24: on the movable member 12 and coacting scale26 on the main'member 10. Referring in particular to Figs. 3, 4 and 5,of the accompanying drawing, in which I have illustrated a modificationof my improved square, the above mentioned movable m-ember 12 hasslidably attached thereto, as at 27 by. a dovetail tongue, adapted toslid- .ably engage a dovetailed recess 28, formed in themovable'member'12, a supplementary member 17 depending therefrom and parallel to themain member 10. The supplemenvtaryv member 17 has attached thereto, as

at 29, a spring 30, depending downward therefrom, and provided with anenlarged extremity 31 adapted to engage serrations or teeth out orotherwise formed in the recess 28, as a means of holding thesupplementary member 17 in any desired relative extended position in therecess 28. The

supplementary member 17 being grooved or notched at both sides of itsextremity, as at 18, to engage a second movable member 19, which isprovided with an elongated aperture 20, located at the center of oneextremity thereof, itbeing understood that the second movable member 19,is pivotally attached to the said supplementary member 17, as at 21, bya screw, bolt, or the like, so as to permit the said second movablemember 19 to be pivoted as designated by the dot and dash lines 22.

It will be further understood that the main member 10, the movablemember 12, the supplementary member 17, and the second movable member19, areprovided with graduations 23, adjacent to the sides thereof,preferably in inches and fractions thereof, suitably engraved, etched,or otherwise affixed thereto.

, It will also be understood that the movable member 12, and the secondmovable member 19, are provided with graduations 24, adjacent to thecurved portions 25, in 7 degrees, and minutes, and them-ember 10 and thesupplementary secondary member 17, are provided with graduations 26,adjacent to the curved portions 25, so as to provide a'scale, oradjustment for the said movable member 12, and the said second movableni ember 19. g

It will be further understood that my improved square may be made of anysuitable material,- preferably steel, and in any suitable siZe such asmay be desired by artisans of 'all trades using a square of thisdescription.

Having thus described my invention, what I claim as new, and desire toprotect by Letters Patent of the United States is as tremity, a movablemember pivotally attached to said main member, and formed with adovetailed recess, a supplementary main member formed at one end with a5 dovetail tongue engageable in said dovetailed recess, a springdepending from said supplementary main member, serrations formed .insaid dovetailed recess, and said spring being formed with an enlargedextremity engageable against said serrations. 10

In testimony whereof I have aflixed my signature.

GEORGE S 1 SCHVETZ.

